I am a former Electrical Engineer and studied TV repair once upon a time. I have a scope, multi-meter, and soldering gun. Can you point me in the right direction?I am a former Electrical Engineer and studied TV repair once upon a time. I have a scope, multi-meter, and soldering gun. Can you point me in the right direction?

Http://nettopdf.info/download/pdf/Service%20Manual/aHR0cDovL3d3dy5tYW5hZ2VteWxpZmUuY29tL21taC9saXNfcGRmL09XTk0vTDA2MDQ4OTEucGRm
www.managemylife.com/mmh/lis_pdf/OWNM/L0604891.pdfAbove are your service manuals.
This is a fairly classic switchmode power supply, I see this type of fault very frequently in my shop. The special fault detection circuitry in the PS, is shutting the set down to avoid a fire, explosion, or both. This set had developed a problem, that is so severe that the set must be shut down, This set should be removed from the Power.
In my professional recommendation, you should get a "Quote" for repair, from, a, Proton Approved Service Center, this point is very important for a good result, Always contact, their local, "Head Office" Now, when you get the information you want, then you can decide as to repair of replacement. The reason we want an approved agent, is that way, all the engineers are trained on their own brand sets, they have seen almost all faults, and will get the job done quicker, and for less cost, and usually have parts on hand, also sometimes, there has been a service bulletin in issued and the repair may be subsided or even free.
There are many, many types of "Faults" that can cause this, so the issue must be troubleshot.
Below is the link for Proton.www.protonav.com/

This is definitely an indication of major hardware failure inside the TV, most likely the power board, but it is hard to say with certainty. Unfortunately this is a very difficult repair, and unless you are an
electrician I would not recommend attempting it. You will need to
contact a local TV repair person in your area. If you think it may
still be under warranty please contact the manufacturer to file an
RMA. If you happened to purchase the TV with a major credit card (not
a debit card) there is a good chance it may still be under the free
extended warranty most credit cards place on electronics. Please
contact your credit card company to inquire if they do this, and they
will be able to file the claim and get you a refund for the TV.

So sorry that I don't have better news but it is definitely a power issue internally.

Alright the first place to start would be to open up the TV and check all boards, especially the power supply board which you should be able to easily locate, it's where the power first flows to. Look for bulging capacitors or any other obvious issues like that. From there follow the flow of power and check for obvious damage like capacitors... those are the most common things to go, see if a cap somewhere is bulged or blown.

Let me know!TimAlright the first place to start would be to open up the TV and check all boards, especially the power supply board which you should be able to easily locate, it's where the power first flows to. Look for bulging capacitors or any other obvious issues like that. From there follow the flow of power and check for obvious damage like capacitors... those are the most common things to go, see if a cap somewhere is bulged or blown.

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Sounds like a built in protector kicking in. Something probably has shorted. Try disconnecting the inverter (should look like this: http://marcoselectronics.com/images/48.V1448.001.JPG) to see if you can get the TV to power on without a picture. Be careful - this is a high voltage board.

Symptoms of a Defective or dying Power supplies on LCD TVs.1. Light(s) on the front panel are behaving not normal example, blinking, amber color or not steady, fainting, etc.2. TV not turning ON properly.3. TV turns OFF by itself.4. Needs to be unplug to many times to make it work.5. Humming or high pitch noise heard through speakers or at the back of the TV.

Unfortunately, Protron LCD's are very low quality, mine went out in 15months. Your problem may be similar to one I had & I fixed it by cycling the on/off switch next to where the power cord goes in the back of the TV. Also make sure the power cord is inserted right since the "yellow" light indicate powering up but not full power. Hope this fixes it since I couldn't find ANYONE that services/repairs PROTRON brand.